Observation of the low to high confinement transition in the large helical device
The low to high confinement transition has been observed on the large helical device [A. Iiyoshi, A. Komori, A. Ejiri et al. , Nucl. Fusion 39, 1245 (1999)], exhibiting rapid increase in edge electron density with sharp depression of H α emission. The transition occurs in low toroidal field ( B t =...
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| creator | Toi, K. Ohdachi, S. Yamamoto, S. Sakakibara, S. Narihara, K. Tanaka, K. Morita, S. Morisaki, T. Goto, M. Takagi, S. Watanabe, F. Nakajima, N. Watanabe, K. Y. Ida, K. Ikeda, K. Inagaki, S. Kaneko, O. Kawahata, K. Komori, A. Masuzaki, S. Matsuoka, K. Miyazawa, J. Nagaoka, K. Nagayama, Y. Oka, Y. Osakabe, M. Ohyabu, N. Takeiri, Y. Tokuzawa, T. Tsumori, K. Yamada, H. Yamada, I. Yoshinuma, K. LHD Experimental Group |
| description | The low to high confinement transition has been observed on the large helical device [A. Iiyoshi, A. Komori, A. Ejiri
et al.
, Nucl. Fusion
39, 1245 (1999)], exhibiting rapid increase in edge electron density with sharp depression of
H
α
emission. The transition occurs in low toroidal field
(
B
t
=
0.5
–
0.75
T
)
discharges and are heated by high power neutral beam injection. The plasma thus has a relatively high value
(
∼
1.5
%
)
of the volume averaged
β
value. The electron temperature and density profiles have steep gradients at the edge region which has high magnetic shear but is at a magnetic hill. Formation of the edge transport barrier leads to enhanced activities of the interchange type of modes with
m
=
2
∕
n
=
3
(
m
,
n
are the poloidal and toroidal mode numbers) in the edge region. At present, these magnetohydrodynamic activities limit the rise of the stored energy; the resultant increment of the stored energy remains modest. |
| doi_str_mv | 10.1063/1.1843122 |
| format | Article |
| fullrecord | <record><control><sourceid>scitation_osti_</sourceid><recordid>TN_cdi_osti_scitechconnect_20698319</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>pop</sourcerecordid><originalsourceid>FETCH-LOGICAL-c402t-2698fa0bd6abe06893dc7140812015383bbccdab544f1f328c71d0b3cd248e523</originalsourceid><addsrcrecordid>eNp90MtKAzEUBuAgCtbqwjcIuFKYmttkMksp3qBQBAV3Ickknch0UpJQ8e2ddoouBFfnwPn4OfwAXGI0w4jTWzzDglFMyBGYYCTqouIVO97tFSo4Z--n4CylD4QQ46WYgJelTjZuVfahh8HB3FrYhU-YA2z9qoUm9M73dm37DHNUffJ76ftRqriysLWdN6qDjd16Y8_BiVNdsheHOQVvD_ev86disXx8nt8tCsMQyQXhtXAK6YYrbREXNW1MhRkSmCBcUkG1NqZRumTMYUeJGK4N0tQ0hAlbEjoFV2NuSNnLZHy2ph3e7a3JkqAhnuJ6UNejMjGkFK2Tm-jXKn5JjOSuMYnlobHB3ox2F7Zv5AdvQ_yFctO4__Df5G8233lZ</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>Observation of the low to high confinement transition in the large helical device</title><source>AIP Journals Complete</source><source>AIP Digital Archive</source><creator>Toi, K. ; Ohdachi, S. ; Yamamoto, S. ; Sakakibara, S. ; Narihara, K. ; Tanaka, K. ; Morita, S. ; Morisaki, T. ; Goto, M. ; Takagi, S. ; Watanabe, F. ; Nakajima, N. ; Watanabe, K. Y. ; Ida, K. ; Ikeda, K. ; Inagaki, S. ; Kaneko, O. ; Kawahata, K. ; Komori, A. ; Masuzaki, S. ; Matsuoka, K. ; Miyazawa, J. ; Nagaoka, K. ; Nagayama, Y. ; Oka, Y. ; Osakabe, M. ; Ohyabu, N. ; Takeiri, Y. ; Tokuzawa, T. ; Tsumori, K. ; Yamada, H. ; Yamada, I. ; Yoshinuma, K. ; LHD Experimental Group</creator><creatorcontrib>Toi, K. ; Ohdachi, S. ; Yamamoto, S. ; Sakakibara, S. ; Narihara, K. ; Tanaka, K. ; Morita, S. ; Morisaki, T. ; Goto, M. ; Takagi, S. ; Watanabe, F. ; Nakajima, N. ; Watanabe, K. Y. ; Ida, K. ; Ikeda, K. ; Inagaki, S. ; Kaneko, O. ; Kawahata, K. ; Komori, A. ; Masuzaki, S. ; Matsuoka, K. ; Miyazawa, J. ; Nagaoka, K. ; Nagayama, Y. ; Oka, Y. ; Osakabe, M. ; Ohyabu, N. ; Takeiri, Y. ; Tokuzawa, T. ; Tsumori, K. ; Yamada, H. ; Yamada, I. ; Yoshinuma, K. ; LHD Experimental Group</creatorcontrib><description>The low to high confinement transition has been observed on the large helical device [A. Iiyoshi, A. Komori, A. Ejiri
et al.
, Nucl. Fusion
39, 1245 (1999)], exhibiting rapid increase in edge electron density with sharp depression of
H
α
emission. The transition occurs in low toroidal field
(
B
t
=
0.5
–
0.75
T
)
discharges and are heated by high power neutral beam injection. The plasma thus has a relatively high value
(
∼
1.5
%
)
of the volume averaged
β
value. The electron temperature and density profiles have steep gradients at the edge region which has high magnetic shear but is at a magnetic hill. Formation of the edge transport barrier leads to enhanced activities of the interchange type of modes with
m
=
2
∕
n
=
3
(
m
,
n
are the poloidal and toroidal mode numbers) in the edge region. At present, these magnetohydrodynamic activities limit the rise of the stored energy; the resultant increment of the stored energy remains modest.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/1.1843122</identifier><identifier>CODEN: PHPAEN</identifier><language>eng</language><publisher>United States</publisher><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY ; BEAM INJECTION HEATING ; BOUNDARY LAYERS ; ELECTRON DENSITY ; ELECTRON TEMPERATURE ; LHD DEVICE ; MAGNETOHYDRODYNAMICS ; NEUTRAL ATOM BEAM INJECTION ; PLASMA CONFINEMENT ; PLASMA DENSITY ; STORED ENERGY</subject><ispartof>Physics of plasmas, 2005-02, Vol.12 (2)</ispartof><rights>American Institute of Physics</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c402t-2698fa0bd6abe06893dc7140812015383bbccdab544f1f328c71d0b3cd248e523</citedby><cites>FETCH-LOGICAL-c402t-2698fa0bd6abe06893dc7140812015383bbccdab544f1f328c71d0b3cd248e523</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://pubs.aip.org/pop/article-lookup/doi/10.1063/1.1843122$$EHTML$$P50$$Gscitation$$H</linktohtml><link.rule.ids>230,314,780,784,794,885,1559,4512,27924,27925,76384,76390</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/20698319$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Toi, K.</creatorcontrib><creatorcontrib>Ohdachi, S.</creatorcontrib><creatorcontrib>Yamamoto, S.</creatorcontrib><creatorcontrib>Sakakibara, S.</creatorcontrib><creatorcontrib>Narihara, K.</creatorcontrib><creatorcontrib>Tanaka, K.</creatorcontrib><creatorcontrib>Morita, S.</creatorcontrib><creatorcontrib>Morisaki, T.</creatorcontrib><creatorcontrib>Goto, M.</creatorcontrib><creatorcontrib>Takagi, S.</creatorcontrib><creatorcontrib>Watanabe, F.</creatorcontrib><creatorcontrib>Nakajima, N.</creatorcontrib><creatorcontrib>Watanabe, K. Y.</creatorcontrib><creatorcontrib>Ida, K.</creatorcontrib><creatorcontrib>Ikeda, K.</creatorcontrib><creatorcontrib>Inagaki, S.</creatorcontrib><creatorcontrib>Kaneko, O.</creatorcontrib><creatorcontrib>Kawahata, K.</creatorcontrib><creatorcontrib>Komori, A.</creatorcontrib><creatorcontrib>Masuzaki, S.</creatorcontrib><creatorcontrib>Matsuoka, K.</creatorcontrib><creatorcontrib>Miyazawa, J.</creatorcontrib><creatorcontrib>Nagaoka, K.</creatorcontrib><creatorcontrib>Nagayama, Y.</creatorcontrib><creatorcontrib>Oka, Y.</creatorcontrib><creatorcontrib>Osakabe, M.</creatorcontrib><creatorcontrib>Ohyabu, N.</creatorcontrib><creatorcontrib>Takeiri, Y.</creatorcontrib><creatorcontrib>Tokuzawa, T.</creatorcontrib><creatorcontrib>Tsumori, K.</creatorcontrib><creatorcontrib>Yamada, H.</creatorcontrib><creatorcontrib>Yamada, I.</creatorcontrib><creatorcontrib>Yoshinuma, K.</creatorcontrib><creatorcontrib>LHD Experimental Group</creatorcontrib><title>Observation of the low to high confinement transition in the large helical device</title><title>Physics of plasmas</title><description>The low to high confinement transition has been observed on the large helical device [A. Iiyoshi, A. Komori, A. Ejiri
et al.
, Nucl. Fusion
39, 1245 (1999)], exhibiting rapid increase in edge electron density with sharp depression of
H
α
emission. The transition occurs in low toroidal field
(
B
t
=
0.5
–
0.75
T
)
discharges and are heated by high power neutral beam injection. The plasma thus has a relatively high value
(
∼
1.5
%
)
of the volume averaged
β
value. The electron temperature and density profiles have steep gradients at the edge region which has high magnetic shear but is at a magnetic hill. Formation of the edge transport barrier leads to enhanced activities of the interchange type of modes with
m
=
2
∕
n
=
3
(
m
,
n
are the poloidal and toroidal mode numbers) in the edge region. At present, these magnetohydrodynamic activities limit the rise of the stored energy; the resultant increment of the stored energy remains modest.</description><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</subject><subject>BEAM INJECTION HEATING</subject><subject>BOUNDARY LAYERS</subject><subject>ELECTRON DENSITY</subject><subject>ELECTRON TEMPERATURE</subject><subject>LHD DEVICE</subject><subject>MAGNETOHYDRODYNAMICS</subject><subject>NEUTRAL ATOM BEAM INJECTION</subject><subject>PLASMA CONFINEMENT</subject><subject>PLASMA DENSITY</subject><subject>STORED ENERGY</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><recordid>eNp90MtKAzEUBuAgCtbqwjcIuFKYmttkMksp3qBQBAV3Ickknch0UpJQ8e2ddoouBFfnwPn4OfwAXGI0w4jTWzzDglFMyBGYYCTqouIVO97tFSo4Z--n4CylD4QQ46WYgJelTjZuVfahh8HB3FrYhU-YA2z9qoUm9M73dm37DHNUffJ76ftRqriysLWdN6qDjd16Y8_BiVNdsheHOQVvD_ev86disXx8nt8tCsMQyQXhtXAK6YYrbREXNW1MhRkSmCBcUkG1NqZRumTMYUeJGK4N0tQ0hAlbEjoFV2NuSNnLZHy2ph3e7a3JkqAhnuJ6UNejMjGkFK2Tm-jXKn5JjOSuMYnlobHB3ox2F7Zv5AdvQ_yFctO4__Df5G8233lZ</recordid><startdate>20050201</startdate><enddate>20050201</enddate><creator>Toi, K.</creator><creator>Ohdachi, S.</creator><creator>Yamamoto, S.</creator><creator>Sakakibara, S.</creator><creator>Narihara, K.</creator><creator>Tanaka, K.</creator><creator>Morita, S.</creator><creator>Morisaki, T.</creator><creator>Goto, M.</creator><creator>Takagi, S.</creator><creator>Watanabe, F.</creator><creator>Nakajima, N.</creator><creator>Watanabe, K. Y.</creator><creator>Ida, K.</creator><creator>Ikeda, K.</creator><creator>Inagaki, S.</creator><creator>Kaneko, O.</creator><creator>Kawahata, K.</creator><creator>Komori, A.</creator><creator>Masuzaki, S.</creator><creator>Matsuoka, K.</creator><creator>Miyazawa, J.</creator><creator>Nagaoka, K.</creator><creator>Nagayama, Y.</creator><creator>Oka, Y.</creator><creator>Osakabe, M.</creator><creator>Ohyabu, N.</creator><creator>Takeiri, Y.</creator><creator>Tokuzawa, T.</creator><creator>Tsumori, K.</creator><creator>Yamada, H.</creator><creator>Yamada, I.</creator><creator>Yoshinuma, K.</creator><creator>LHD Experimental Group</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>20050201</creationdate><title>Observation of the low to high confinement transition in the large helical device</title><author>Toi, K. ; Ohdachi, S. ; Yamamoto, S. ; Sakakibara, S. ; Narihara, K. ; Tanaka, K. ; Morita, S. ; Morisaki, T. ; Goto, M. ; Takagi, S. ; Watanabe, F. ; Nakajima, N. ; Watanabe, K. Y. ; Ida, K. ; Ikeda, K. ; Inagaki, S. ; Kaneko, O. ; Kawahata, K. ; Komori, A. ; Masuzaki, S. ; Matsuoka, K. ; Miyazawa, J. ; Nagaoka, K. ; Nagayama, Y. ; Oka, Y. ; Osakabe, M. ; Ohyabu, N. ; Takeiri, Y. ; Tokuzawa, T. ; Tsumori, K. ; Yamada, H. ; Yamada, I. ; Yoshinuma, K. ; LHD Experimental Group</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c402t-2698fa0bd6abe06893dc7140812015383bbccdab544f1f328c71d0b3cd248e523</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</topic><topic>BEAM INJECTION HEATING</topic><topic>BOUNDARY LAYERS</topic><topic>ELECTRON DENSITY</topic><topic>ELECTRON TEMPERATURE</topic><topic>LHD DEVICE</topic><topic>MAGNETOHYDRODYNAMICS</topic><topic>NEUTRAL ATOM BEAM INJECTION</topic><topic>PLASMA CONFINEMENT</topic><topic>PLASMA DENSITY</topic><topic>STORED ENERGY</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Toi, K.</creatorcontrib><creatorcontrib>Ohdachi, S.</creatorcontrib><creatorcontrib>Yamamoto, S.</creatorcontrib><creatorcontrib>Sakakibara, S.</creatorcontrib><creatorcontrib>Narihara, K.</creatorcontrib><creatorcontrib>Tanaka, K.</creatorcontrib><creatorcontrib>Morita, S.</creatorcontrib><creatorcontrib>Morisaki, T.</creatorcontrib><creatorcontrib>Goto, M.</creatorcontrib><creatorcontrib>Takagi, S.</creatorcontrib><creatorcontrib>Watanabe, F.</creatorcontrib><creatorcontrib>Nakajima, N.</creatorcontrib><creatorcontrib>Watanabe, K. 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Y.</au><au>Ida, K.</au><au>Ikeda, K.</au><au>Inagaki, S.</au><au>Kaneko, O.</au><au>Kawahata, K.</au><au>Komori, A.</au><au>Masuzaki, S.</au><au>Matsuoka, K.</au><au>Miyazawa, J.</au><au>Nagaoka, K.</au><au>Nagayama, Y.</au><au>Oka, Y.</au><au>Osakabe, M.</au><au>Ohyabu, N.</au><au>Takeiri, Y.</au><au>Tokuzawa, T.</au><au>Tsumori, K.</au><au>Yamada, H.</au><au>Yamada, I.</au><au>Yoshinuma, K.</au><au>LHD Experimental Group</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Observation of the low to high confinement transition in the large helical device</atitle><jtitle>Physics of plasmas</jtitle><date>2005-02-01</date><risdate>2005</risdate><volume>12</volume><issue>2</issue><issn>1070-664X</issn><eissn>1089-7674</eissn><coden>PHPAEN</coden><abstract>The low to high confinement transition has been observed on the large helical device [A. Iiyoshi, A. Komori, A. Ejiri
et al.
, Nucl. Fusion
39, 1245 (1999)], exhibiting rapid increase in edge electron density with sharp depression of
H
α
emission. The transition occurs in low toroidal field
(
B
t
=
0.5
–
0.75
T
)
discharges and are heated by high power neutral beam injection. The plasma thus has a relatively high value
(
∼
1.5
%
)
of the volume averaged
β
value. The electron temperature and density profiles have steep gradients at the edge region which has high magnetic shear but is at a magnetic hill. Formation of the edge transport barrier leads to enhanced activities of the interchange type of modes with
m
=
2
∕
n
=
3
(
m
,
n
are the poloidal and toroidal mode numbers) in the edge region. At present, these magnetohydrodynamic activities limit the rise of the stored energy; the resultant increment of the stored energy remains modest.</abstract><cop>United States</cop><doi>10.1063/1.1843122</doi><tpages>4</tpages><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 1070-664X |
| ispartof | Physics of plasmas, 2005-02, Vol.12 (2) |
| issn | 1070-664X 1089-7674 |
| language | eng |
| recordid | cdi_osti_scitechconnect_20698319 |
| source | AIP Journals Complete; AIP Digital Archive |
| subjects | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY BEAM INJECTION HEATING BOUNDARY LAYERS ELECTRON DENSITY ELECTRON TEMPERATURE LHD DEVICE MAGNETOHYDRODYNAMICS NEUTRAL ATOM BEAM INJECTION PLASMA CONFINEMENT PLASMA DENSITY STORED ENERGY |
| title | Observation of the low to high confinement transition in the large helical device |
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